[Tarantool-patches] [PATCH v2 2/3] box: make constraint operations transactional

[Vladislav Shpilevoy]

> Anyway, patch LGTM. This is second one approve so it can be pushed,
> but Sergos wrote that he is concerned about memory management
> during constraint id creation/drop. Sergos, did you find any
> issues, or we can push this patch?

I see sometimes, that random box tests hang. In logs I see
nothing, or mp_tuple_assert fail even before a test is started.
I tried to run with ASAN - found nothing. Did one another
self-review - nothing. Probably these were problems with luajit,
don't know. Can't reproduce anywhere.